Method of assembling commutators.



L. CHWIMELFENG.

METHOD OF ASSEMBUNG COMMUTATORS.

APPLICATION FILED MAR. I, 1916.

Patented Feb. 6, 1917.

elk/panic JEAN L. SCHIMMELFENG, OF WARREN, PENNSYLVANIA.

METHOD OF ASSEMBLING GOMMUTATGRS.

1,214,96ilu Specification of Letters Patent.

ll-"atenteri Feb. 3, 1917.

Application filed March 1, 1918. Serial No. 83,3942.

To (525 whom it may] concern:

Be it known that I, JEAN L. SCHIMMEL- name, a citizen of the United States, residing at Warren, in the county of Warren and State of Pennsylvania. have invented new .andhseful improvements in Methods of Assemhling @ommutators, of which. the following is specification.

v This invention relates to methods of assembling eommutators and consists in certain improvements 2 ierein as will he hereinafter fully described and pointed out in the claims.

Cornmutater bars are ordinarily formed with dovetailed shanks forming hevels at the ends and these are engaged by rings having corresponding bevels, the rings being connected by a shaft or shell so as to hold the assembled he s and their insulating mate rial together. It is desirable to draw the bars radially and. to secure them under compression so that there is a clamping action circumfcrentially not only holding the bars in place but the insulating material. Devices forcarrying out my process are illustrated.

in the accompanying drawingsas followsz- Figure 1 shows aportion of a press with a commutator in process of assembling in section.

Fig. 2 is plan view of an assembled commutator.

Fig. is a section on the axis of the commutator.

1 marks the commutator bars. These have the dovetail shaped shanks 2 forming the lee-vols at the ends. The ring 3 having the hovel correspondingto the hovel on the shank 2 is arranged at one end. This has the shaft or shell 5 extending axially through the commutator forming an 0pening through which the shaft (not shown) on which the commutator is usually mounted extends. A ring 6 is arranged at the opposite end of the commutator from the ring 3 and it has the beveled shoulder 7 corresponding to the beveled end of the shank 2. The ring 3 has a tapered opening 6" extending through it and the end of the shell or shaft 5 extends through this opening,

Insulating strips 8 are arranged between the commutator bars and insulating strips 9 are arranged. between the rings 3 and 6 and the commutator bars.

In assembling the commutator. the bars are arranged as shown in Fig. 1 with the in sulating strips between the bars and the 1ncured at the upper end the die and. it

is connected to a pressure head 1? by bolts 18, the bolts being screwed into the head 17 and extending t-rough perforations 19 in the cross head 16. A spring 20 is arrangedoetwcen the cross head 16 and the pressure head 17. The nrcssure head 17 has a ring .4 1 1 I 0 i7 anaptecl to engage the ring 0 as tl e die 18 forced downwardly by the press. The die is carried by the reciprocating plunger 21 mounted in an ordinary press Carrying out the process the plunger 21 is forced downwardly carrying with it the die. The extension 1% enters the end of the shell thus holding fully expanded. The ring 17 of the pressure head 17 reaches the ring 6 and with a further movement of the plunger exerts atrial pressure the ring 6 which pressure operating, through the beveled shoulders 4; and Y in opposition to the beveled shoulders on the ends of the dovetailed shanks 2 draw the commutator bars inwardiy and this inward movement of the commutator bars brin 's them into a smaller circumference and. consequently clamps them circumferentiaily, firmly securing them together firmly sec the insulating strips in place. 5/ it the continued movement of the die 13. the pressure f om the pressure head on the rings is continued, the spring 20 yielding and allowing the continued movement of the die, When the forming; shoulder reaches the end of the shell 5 it forces the end of the shell 5 over "forming a head i? (see Fig. 3) which cornplates the connection setwee'nthe rings. It will be noted that as the shell 5 is headed over the rings 3 and. S are under axial pres sure so that the heading over is done without the pressure being slaelrcned in the least on the rings. This assures a positivc'clamping of the through the action of the rings 3 and 6.

What 1 claim as new is- 1. The method oiassembling commutator:

or here having clovel-Ie will eveled ends; interposed V. sri ps; lzepcred end rings on the Leveled surfaces of the dove-tailed shanks; and interposed insulating material between the rings and. the bars which consist; in 6X- aerial pressure on the rings to draw the hire inwardly and compress them and the inierpesed insulation cirous'nferentially end seem-hm the rings togelcher While under A 130531 l method of assembling connnutetors prising eonnnut'ator hers halving dovetailed slmnll's with, beveled ends; interposed msuleclne" strlos" ta ered end r111 s on the beveled surfaces of the dove-tailed shanks; interposed insulating material between the rings and the bars; and a connecting shaft between the rings, one end of the shaft extending through one of the rings, which conslsts in exertlng a-Xml pressure on the rlngs to draw the bars inwardly end compress them and the interposed insuleting n'laterial clrrumferentially and heading over the shaft while the rings are subjected to the axial. pressure.

In testimony whereof K have hereunto eel; myhancl.

JEAN L. SCHlMMELFENG-a 

